"Yep, those photos are very close. I'm relieved my Hibiscus is the more commonly seen type. I don't need a bunch of cops screeching to a halt every time they pass my front porch."
Do you really think they're very close? A quick perusal of those two pictures reveals that other than a general similarity in the outline and arrangement of the leaves, there are many differences. The MJ plant has green stalks and shoots - the hibiscus has reddish stalks and shoots. The MJ plant's leaves have a characteristic ribbing on them that the hibiscus plant's leaves lack. And the MJ plant is much bushier, for lack of a better word.
At first glance, yes, I think the plants are similar. And, from the street, looking at one of those Texas Stars on a front porch, I would bet money a nosey neighbor or an overzealous rookie cop could very well make a mistake in botanical classification between the 2 plants.
Unless, of course, the Texas Star was covered in those pretty red blooms.